Not really - "Everything is open-source if you know Assembly" - Look at Ghidra for example.
If code isn't obfuscated you can do an analysis what kinda stuff closed source software does. In C# (so if his game is written in Unity) you can even get very close to the original source code (IL code reversed back to C#).
That's why I mentioned anti-virus isn't going to be happy about it. You can easily google examples: examples[1] example[2] example[3] - that obfuscating is a red flag to a lot of anti-virus
Probably, AWS and Google probably have millions of existing customers using Redis. And AWS and Google are not going to be paying for it themselves of course, but just pass the costs on to their customers.
So they can stick to the old official Redis version for a while, before the license change happened, but at some point someone might find a vulnerability, and patch it in the official Redis, and then everyone that's stuck on the old version is fucked - it's a bit of a ticking time-bomb to be stuck on an old version.
So then AWS and Google customers can decide
So if they already switch to an open-license fork they can preemptively mitigate most of those risks